Apparatus for producing an alternating magnetic field for therapeutic purposes.



No. 761,199. B BUHTZ PATENTED MAY 31, 1904. APPARATUS FOR PRODUCING AN ALTRRNATING MAGNETIC FIELD FOR THERAPEUTIC PURPOSES.

APPLICATION FILED JAN. 30. 1904.

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No. 761,199I

Patented May 31, 1904.

UNITED STATES PATENT OFFICE;

ERNST BUHTZ, OF BERLIN, GERMANY, ASSIGNOR OF TWO-THIRDS TO RUDOLPH LUTHI 'AND ANDREAS GURLITT, OF BERLIN, GERMANY.

APPARATUS FOR PRODUCING AN ALTERNATING MAGNETIC FIELD FOR THERAPEUTIC PURPOSES.

SPECIFICATION forming part of Letters Patent No. 761,199, dated May 31, 1904.

Application filed January 30, 1904. Serial No. 191,244. (No model.)

To a. whom it may concern:

Be it known that I, ERNST BUHTZ, a subject of the King of Prussia, German Emperor,

residing at 86 to 88 Mauerstrasse, Berlin, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Apparatus for Producing an Alternating Magnetic Field for Therapeutic Purposes, of which the following is a specification.

The present invention relates to an apparatus for producing an alternating magnetic field which can be brought to bear upon persons sufiering from nervous diseases which are to be cured by the apparatus in question.

The general form of an apparatus for performing this treatment consists oftwo or more magnets arranged about a common shaft. The lines of force passing between their poles produce on rotation of the apparatus a sort of vortex of lines of force, which enhances the therapeutic properties of the magnetic field.

In the accompanying drawings a simple form of apparatus is shown which illustrates the invention.

Figure I is a side elevation, partly in section; and Fig. 2 is a sectional view of Fig. 1 on the line A A viewed in the direction of the arrow. r

The magnet-core a, of soft iron, is secured,

by means of a pin Z), to a rotary shaft 0 and provided at both ends with coils d. A constant current of desired tension and strength is supplied to these coils from a dynamo or accumulator-battery through the collars e and brushes f. The ends of the shaft 0 rotate in bearings p and g. In the frame-sections s and 0', respectively, said frame-sections are rigidly connected by rods t t, which firmly brace the various parts and make a compact and strong device. The construction at the same time provides an expedient and inexpensive means for inclosing the rapidly-rotating parts, thereby enabling the operator to easily and quickly handle the device without danger of being injured. The current passes from its source to the terminal screw 01, thence to the brush f, through one of the collars e, the coils of the magnet, and the other collar 6, over the second brush f to terminal screw 0 and back to-its source.

At the poles of the magnet an are secured two shoes 9 by means of screws m. These shoes lie in the direction of the axis of rotation, and for the purpose ofsecuring them against the action of the centrifugal force evolved it is desirable to strut them one against the other by means of strips of brass h. The rotating magnet is incased in a drum c', made of fiber or other suitable material and covered in front with a plate j, which is attached to theframe-section r and covered in the back by the section 8, which also acts, as a support and fastening means for the terminals n and '0 and the connection with the brushes ff.

Extending from the section sand substantially parallel with the rotary shaft are supporting-rods '2; o, which'suitably support the casing of any motor and as lndicated 1n the drawings 1n this case as an electric motor,

which may receive its energizing-current from the same terminals n and 0 in any suitable manner readily suggested to those skilled in the art. The shaft 0 is connected, by means of a suitable coupling is, with the electromotor Z, which rotates it rapidly.

yisa yoke pivotally connected to the framesection 8 in such a manner that the generator and motor are evenly balanced on pivotal points r r and can be easily swung into any position by one hand of the operator. A sus pension-cable supporting the device in mid-air containing the wires conducting the current may be attached to the yoke at the openings and from which the Wires can be easily at.- tached to the binding-terminals a and 0, leading the current to either the brushes ff or the motor Z.

The operation of the apparatus is as follows: On the two coils of, the magnet being excited there passes between the outer ends of the shoes 9 an arc of magnetic lines of force. This are passes through the cover j and may be extended at will by means of a soft-iron magnet, and with it the are of lines of force, in rotation, every nerve in the particular spot under treatment will be acted upon in every direction by the lines of force. The magnet may also be excited by an alternating current instead of a constant one without the effect of the apparatus beingaltered, provided that the rate of alternation be made to agree with the rate of rotation of the motor, so that the character of the magnetic field remains unaffected.

What I claim as my invention, and desire to secure by Letters Patent, is*

1. In an apparatus for producing an alternating magnetic field, for therapeutic purposes and the like, the combination of a rotary shaft supported in a bearing at each of its ends, a plurality of electromagnets, attached to said shaft and rotating with the same between the said bearings, means for supplying current to said magnets and means for rotating the shaft, substantially as described.

' 2. In an apparatus for producing an alternating magnetic field for therapeutic purposes and the like, the combination of a rotary shaft supported in a bearing at each of its ends, a plurality of electromagnets having shoes se cured to their ends, said magnets attached to said rotary shaft and rotating with the same and between said bearings, means for supplying current to said electromagnets and a motor for rotating said shaft, substantially as set forth.

3. In an apparatus for producing an alter natingmagnetic field for therapeutic purposes and the like, the combination of a rotary shaft supported in a bearing at each of itsends, a plurality of electromagnets attached to said rotary shaft between said bearings, shoes secured to the ends ofthe said electromagnets, stiffening-straps connecting the-ends of the shoes, means for supplying current to said electro magnets and a motor for rotating the shaft, substantially as set forth.

4. In an apparatus for producing an alternatingmagnetie field for therapeutic purposes and the like, the combination of a rotary shaft supported in a bearing at each of its ends, a plurality of electromagnets attached to said 'rotary shaft between said bearings, shoes secured to the ends of the electromagnets, a plate supported in proximity to the pole ends of the shoes, means for supplying current to said electromagnets and a motor for rotating the shaft, substantially as set forth.

5. In an apparatus for producing an alternatingmagnetic field for therapeutic purposes and the like, the combination of a rotary shaft supported in a bearing at each of its ends, a plurality of electromagnets attached to said rotary shaft between said bearings, shoes secured to the ends of the electromagnets, stiffeningstraps connecting the ends of the shoes, a plate supported in proximity to the pole ends of the shoes, means for supplying current to said electromagnets and a motor for rotating the shaft, substantially as set forth.

6. In an apparatus for producing an alternating magnetic field for therapeutic purposes and the like, the combination of two separated frame-sections, a bearing in each of said sections, a rotary shaft supported in said bearings, electromagnets attached to said rotary shaft between said bearings, shoes secured to the ends of the electromagnets, a plate supported in proximity to the pole ends of the shoes and secured to the adjacent frame-section, means for supplying current to said electromagnets and a motor for rotating the shaft, substantially as set forth.

7. In an apparatus for producing an alternating magnetic field for therapeutic purposes and the like, the combination of two separated frame-sections, means for securing them in a rigid position, a bearing in each of said framesections, a rotary shaft supported in said bearings, electromagnets attached to said shaft and rotatingbetween said bearings, shoes secured to the ends of the said magnets, stiffeningstraps connecting the ends of the shoes, means for supplying current to said electromagnets and a motor for rotating the shaft, substantially as set forth.

8'. In an apparatus'for producing an alternating magnetic field for therapeutic purposes and the like, the combination of two separated frame-sections, a bearing in each of said sections,a rotary shaft supported in said bearings, electromagnets attached to said rotary shaft between said bearings, shoes secured to the ends of the electromagnets, a platesupported in proximity to the pole ends of the shoes and secured to the adjacent frame-section, two collars rotating with said shaft and insulated therefrom and each other, electric conductors connecting said collars with the coils of the electromagnets, and brush-terminals in contact with said collars,substantially as set forth.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

' ERNST BUI-ITZ.

I/Vitnesses:

\V OLD EMAR HAUr'r, HENRY HAsrEn. 

